Water-tube boiler.



P. J. HEALY.

WATER TUBE BOILER.

APPLICATION FILED FEB. 20. 1918.

Patented Feb. 4, 1919 4 SHlzETS-SHIIET trig? M w 1 Am s 14H ii? H x f F!WITNESS A TTOR N E 1Q? P. J. HEALY.

WATER TUBE BOILER.

APPLICATION FILED FEB. 20. 1918 Patented Feb. 4, 1919.

4 SHEETS-SHEET 2.

WITNESS A TTORNE Y5 P. 1. HEALY.

WATER TUBE BOILER.

APPLICATION FILED FEB. 20, I918. II ggg eqgg Patented Feb. 1, 1919.

4 SHEETS SHEET 3.

WITNESS 11v VENTOR.

i wzfz w'wk JI/Ffe A TTORNE Y3 P. J. HEALY.

WATER TUBE BOILER.

v APPLICATION FILED FEB. 20, I918. LQQS MQLD Patented Feb. 1919.

4 SHEETS*SHEET 4- WITNESS INVENTOR. fiaafwdar Jfflemgr A TTORNE Y endsof the endmost tubes 5, as shown in Fig. 2.

The vertically disposed tubes 6 forming the heads of the boiler serve asa support for the main. circulating tubes indicated at 7. These tubesare superposed as shown and they are sufficiently separated to permitthe hot gases of combustion to pass freely therebetween, as willhereinafter be described. The main circulating tubes 7 are also placedon an angle, as shown, to facilitate circulation and they furthermoreserve the purpose of bracing the boiler lengthwise and also serve thepurpose of supports for a pair of superposed bafiie plates constructedof fire brick or the like, such as shown at 8 and 9. The main fire boxis built in between the main mud drums A and is preferably bricked up,as shown at 9, if oil is burned, or provided with grating if a coal fireis used.

Each main steam drum is provided with a dome 10 and a safety valve 11 ofthe usual construction and each drum is also provided with a feed pipe12, which feed pipes are joined, as shown at 13. Each feed pipe isprovided with a valve 14 to permit the steam entering the drum to be ledto escape directly through the feed pipes, if desired, but these valvesare normally maintained closed as the novel arrangement of superheatingpipes has been provided to permit the steam to pass from the respectivedrums into the feed pipe. This is accomplished by placing a series ofcoil tubes crosswise of the boiler above the main circulating tubes 7 asshown at 15.

One end of each coil tube is connected with a. steam drum B, asindicated at 16, while the opposite end is connected with a feed pipe12, as at 17; that is, steam entering the drums B through the tubes 5and 6 cannot escape directly through the feed pipes when the valves areclosed except by passing out through the connections 16, then throughthe superheating coils, and finally through the connections 17 into thefeed pipes 12. The steam is in this manner thoroughly superheated beforeit can finally escape from the boiler and its efiiciency in value isthereby considerably increased.

The boiler shown in the present instance is provided with a pair of oilburners 18, each supported by a door 19. The fire or hot gases ofcombustion will, therefore, first enter the fire box in the direction ofarrow a. It will here strike the brick work at the end of the boiler andwill thus be deflected and returned in the direction of arrow 5 underthe bafiie plate 8. The hot gases on returning will then strike thefront head and will again become deflected and returned in the directionof arrow 0 between the main circulating tubes 7. The gases will againstrike the rear head and are thus finally deflected in a forwarddirection and y will thus pass between the superheating coils 15 beforethey can escape through the stack 21. The hot gases, due to thestructure of the boiler and the position of the baffle plates, passendwise between the tubes several times, thus rendering it possible toobtain greater heat efiiciency, The 'structure, furthermore, makes itpossible to provide an enlarged heating area as all parts of the boilerare constructed of tubing, through which the water circulates and whichis all exposed tothe hot gases, this being true of the main shell, theheads, the drums, the main circulating tubes and also the circulatingtubes.

The main end tubes 6 which support the main circulating tube 7 may beprovided with removable handhold plates, such as shown at 22, to permiteasy access to the tubes 7 when it is necessary to clean the same orrenew tubes at any time. The steam drums, together with the mud drums,are all provided with manhole covers, such as shown at 23, thusrendering all tubes accessible for repairs and cleaning.

The front head of the boiler, shown in Fig. 2, is in reality providedwith an auxiliary mud drum 2 1. This is merely provided to permit theinsertion of a peek hole and air admitting door 25. This door swingsinwardly and is positively locked against outward movement as its lowerend engages the inside of the end mud drum 2. This is of considerableimportance as it positively prevents flare backs from fire or an excessescape of steam if any tube should burst, thus to a great extenteliminating the danger to which firemen are so often exposed.

The construction of the doors 18 also forms an important feature of theinvention as they not only serve as supports for the oil burners whenthese are employed, but they also serve as an ideal means for ad mittingthe air required. Each door is rigidly and. permanently fastened to thefront of the fire box and consists of a front plate 28 and a series ofinclined horizontal and vertical baffle plates 29, together with ahorizontal inner plate 30 and a pair of side plates 31; the function ofthe several plates described being to deflect the air and guide itdownwardly against the bottom of the fire box, thus heating itthoroughly before it strikes the tubing of the boiler. This is of greatimportance as cold air when striking the tubes causes such a variationin expansion as to materially injure the tubes within a short time.These doors also take care of flare backs due to improper combustion andfurthermore serve as a means for dissipating or deflecting escapingsteam from bursted tubes to such an extent as to prevent injury to thefiremen.

The construction as a whole adapts itself readily for locomotive boilersas its length and shape may be such as to conform to the standard linesof a locomotive, it being preferable, however, to build the boiler intwo or more sections when employing it for locomotives to render theforward part more cylindrical in shape than the rear section.

The use of the boiler should, however, under no circumstances be limitedas it readily adapts itself for any other use, such as marine,stationary, and the like.

The main tubing 5 and 6, forming the shell and heads of the boiler,should be covered with asbestos and an exterior covering of sheet, ironto retain the heat and a horizontal flue 21 forming in connection withthe bridging or stack 21 permits the gases to freely escape after they.have passed between the superheating coils 15 and the intermediate tubes6. This part of the boiler may also be covered with insulating materialif desired to lower the boiler room temperature as much as possible.Ialso wish it understood that the materials and finish and the specificarrangement of the parts described may be such as the experience andjucllgment of the manufacturer may dictate.

aving thus described my invention, what I claim and desire to secure byLetters 'Patent is 1. In a water tube boiler, a pair of side mud drums,a pair of superposed steam drums, the side mud drums being locatedconsiderably beyond the outer sides of the respective steam drums, aseries of vertical side tubes connected at their lower ends to the muddrums and having their upper ends curved inwardly and connected to theouter sides of the steam drums, intermediate tubes connected at theirends to the inner sides of the respective steam drums and arrangedbetween the ends of the latter, horizontal end tubes connected at theirends to the respective steam drums, end mud drums connecting the sidemud drums, and vertical head tubes connected'to the horizontal endtubes, to the steam drums and to the bottoms of the curved upper ends ofthe endmost vertical side tubes.

2. In a water tube boiler, a pair of side mud drums, a pair ofsuperposed steam drums, a series of vertical side tubes connected attheir lower ends to the mud drums and having their upper ends curved andconnected to the outer sides of the steam drums, intermediate tubes,connected at their ends to the inner sides of the respective steamdrums, horizontal end tubes connected at their ends to the respectivesteam drums, end mud drums connecting the side mud drums, a series ofspaced vertical head tubes at each end of the boiler connected to thehorizontal end tubes, to'the steam drums and to the curved upper ends ofthe outermost vertical side tubes, and a double series of inclinedlengthwise circulating tubes for each pair of the corresponding oppositevertical head tubes at the boiler ends connected at their ends to eachof the respective vertical head tubes comprising said pairs.

3. In a water tube boiler, a pair of side mud drums, a pair ofsuperposed steam drums, a series of vertical side tubes connected attheir lower ends to the mud drums and having their upper ends curved andconnected to the outer sides of the steam drums, intermediate tubesconnected at their ends to the inner sides of the respective steamdrums, horizontal end tubes connected at their ends to the respectivesteam drums, end mud drums connecting the side mud drums, spacedvertical head tubes connected to the horizontal end tubes, to the steamdrums and to the curved upoper ends of the outermost vertical side tues, the central head tubes at one end of the boiler having their lowerends cutaway to form a'door opening, an auxiliary horizontal short muddrum connected to the lower cutaway ends of the head tubes and havingits ends connected to the next adjacent head tubes to form the top ofthe door opening, the end mud drum at the boiler front forming thebottom of the door opening, and a door in the door opening having itslower side engaged with said front end mud drum.

4. In a water tube boiler, a pairof steam drums at opposite sides of theBoiler, side mud drums, a series of vertical side tubes connected to themud drums and having their upper ends curved inwardly and connected tothe steam drums, intermediate tubes connecting the steam drums, a steamdelivery pipe for each steam drum seated on the respective curved upperends of the vertical side tubes, and a series of superheating tubes foreach steam drum, each'su-perheating tube being connected at one'end to asteam drum and at its opposite end to the delivery pipe of that drum,the intermediate portions of the superheating tubes extending across theboiler and underlying each of the steam drums.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

PATRICK J. HEALY.

